Big Data Analytics Unit-3

What is the primary purpose of using Hadoop in data analysis?

• To run data analysis on a single machine

• To provide parallel processing capabilities

• To visualize data using charts

• To store data in a relational database

Which tool is commonly used for processing line-oriented data in Unix?

• grep

• cut

• awk

• sed

What does the Map function in MapReduce primarily do?

• Processes input data and emits key-value pairs

• Combines results from multiple mappers

• Sorts the output data

• Runs the final output to the user

In the context of MapReduce, what is a combiner function used for?

• To reduce the number of output records

• To combine input data from different sources

• To visualize the output data

• To manage configuration settings

What is the role of the JobTracker in Hadoop?

• To execute map tasks

• To manage the overall job execution process

• To store the output data

• To monitor the health of the cluster

Which class is used to define the Mapper in a Java MapReduce job?

• MaxTemperatureMapper

• Mapper

• MapDriver

• Job

What is the output format of the Map function in MapReduce?

• Data frames

• Key-value pairs

• Sorted lists

• Single values

What does the reduce function do in a MapReduce job?

• It filters the input data

• It finds the maximum value for each key

• It initializes the job configuration

• It formats the output data

What is the significance of the Configuration API in Hadoop?

• To manage user permissions

• To visualize job progress

• To configure job settings and parameters

• To store data in HDFS

Which of the following is a key feature of the new Java MapReduce API?

• It allows batch processing of records

• It requires manual memory management

• It uses interfaces instead of abstract classes

• It does not support context objects